Most people don’t realize this, but Peak can be used to play Audio Units – and VST-format virtual instruments. However, an input method must first be configured. The easiest way is to have a MIDI controller connected to a MIDI port of the host Macintosh computer. Then open Peak’s Preference Panel and go to MIDI Preferences. Select the desired MIDI device and click OK, then click on the Save button to exit Peak’s Preference Panel. Now you’re ready to play any active virtual instruments!